Add 1 tbsp sesame oil to a wok, place on a high heat.
Once hot add the chilli and ginger and fry for a few minutes before adding the garlic and tofu.
In a small bowl, stir together the soy sauce, mirin, sugar, squeeze of ½ lime and remaining sesame oil then add to the wok.
Add the udon noodles to a pot of boiling water and simmer for five minutes.
Toss the wok allowing each side of the tofu to cook then add in the thinly sliced radish and leeks, ½ the sesame seeds then add in the cooked noodles with a splash of the water from the pot, and fry together on a high heat for the final 2-3 minutes.
Garnish with ¼ lime, a sprinkle of sesame seeds. We recommend serving with chili crisp oil (optional).